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Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 3 $ 7 $ 8
Interest cost 8 8 24 25
Expected return on plan assets (9) (10) (27) (30)
Net periodic benefit cost $ 1 $ 1 $ 4 $ 3